Polymeric foams for flexible and highly sensitive low-pressure capacitive sensors. Pruvost, M., Smit, W.J., Monteux, C. et al. npj Flex Electron 3, 7 (2019)

– Polymeric foams for flexible and highly sensitive low-pressure capacitive sensors. Pruvost, M., Smit, W.J., Monteux, C. et al. npj Flex Electron 3, 7 (2019). https://doi.org/10.1038/s41528-019-0052-6

Résumé :
Flexible low-pressure sensors ( <10 kPa) are required in areas as diverse as blood-pressure monitoring, human–computer interactions, robotics, and object detection. For applications, it is essential that these sensors combine flexibility, high sensitivity, robustness, and low production costs. Previous works involve surface micro-patterning, electronic amplification (OFET), and hydrogels. However, these solutions are limited as they involve complex processes, large bias voltages, large energy consumption, or are sensitive to evaporation. Here, we report a major advance to solve the challenge of scalable, efficient and robust e-skin. We present an unconventional capacitive sensor based on composite foam materials filled with conductive carbon black particles. Owing to the elastic buckling of the foam pores, the sensitivity exceeds 35 kPa−1 for pressure <0.2 kPa. These performances are one order of magnitude higher than the ones previously reported. These materials are low-cost, easy to prepare, and display high capacitance values, which are easy to measure using low-cost electronics. These materials pave the road for the implementation of e-skin in commercialized applications.

Highly sensitive material for blood pressure sensor, npj Flex Electron 3, 7 (2019). https://doi.org/10.1038/s41528-019-0052-6